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Single-station Doppler distance-measuring and positioning method

A positioning method and Doppler pulse technology, which is applied in the field of real-time positioning and detection of moving targets by using only the Doppler frequency shift information of a single station, and can solve problems such as the inability to measure the instantaneous velocity and radial distance of moving targets

Active Publication Date: 2009-10-21
CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST
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Problems solved by technology

[0002]Single station Doppler radar generally can only obtain the radial velocity information of the target, and cannot realize the measurement of parameters such as the instantaneous velocity and radial distance of the moving target

Method used

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  • Single-station Doppler distance-measuring and positioning method
  • Single-station Doppler distance-measuring and positioning method
  • Single-station Doppler distance-measuring and positioning method

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Embodiment

[0065] A method for speed measurement, distance measurement and positioning of moving targets by using Doppler pulse radar. figure 1 The basic geometric relationship diagram between the measuring station and the target is given when the target is assumed to fly in a straight line at an average speed; figure 2 The flow chart of iterative calculation is given; Figure 3-Figure 5 The relative error variation curves between the radial distance and the lead angle are given respectively when the pulse period is 0.1s, 0.001 and 0.0001s.

[0066] 1. Formula derivation

[0067] Such as figure 1 As shown, assuming that in a short period of time, the target can be approximated as moving along a straight line segment, and the fixed single-station Doppler pulse radar continuously measures the Doppler frequency shift of the target at a fixed period. Angle β between detection paths i is the leading angle.

[0068] First, according to the Doppler principle, the Doppler frequency shift e...

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Abstract

The invention discloses a single-station Doppler distance-measuring and positioning method, which comprehensively uses a Doppler shift relation, an equal propagation time difference relation and a plane geometric relation and realizes the measurement of the distance and speed of a target in constant linear motion through only three times of successive Doppler shift measurement. According to the three times of successive Doppler shift measurement of adjacent nodes, two ratio equations irrelevant to flight speed can be obtained; according to a condition that stationary periodic pulse propagation time differences on a propagation path are equal, an independent equation irrelative to the flight speed is obtained; and, in addition, suppose that the target performs linear motion, an equation of lead angles is obtained according to internal and external angle theorem in plane geometry. Thus, the total number of the equations needed for solving three lead angles is obtained. After the solution of the lead angles, the moving speed of the target is obtained according to the shit relation, and the radial distance of the target is obtained according to the plane geometric relation. The method of the invention has the advantages of low detection system cost, high measurement accuracy, simple algorithm, good astringency and the like.

Description

Technical field: [0001] The invention belongs to the field of radio tracking and positioning, and in particular relates to a method for real-time positioning and detection of a moving target by using only single-station Doppler frequency shift information. Background technique: [0002] Generally, monostatic Doppler radar can only obtain the radial velocity information of the target, and cannot realize the measurement of parameters such as the instantaneous velocity and radial distance of the moving target. [0003] In order to track and measure maneuvering targets, it is generally necessary to use a network of multiple Doppler radars. Compared with ranging radar, Doppler radar has fewer measurement error sources and higher precision. At present, the speed measurement accuracy of advanced Doppler radar can reach 0.06mm / s. With the development of digital technology and the use of higher frequency carriers, Doppler radar can be made smaller, cheaper and more accurate. Inven...

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Application Information

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IPC IPC(8): G01S7/41G01S13/66
Inventor 郁涛
Owner CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST
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